DE2519687A1 - Stranded electrical cable central glass yarn - latter acting as tensile stress accepting core in high speed cable stranding - Google Patents

Abstract

The multifil glass yarn which may have a diameter of ca. 7 mu m is used as a core round which the individual wires are twisted in the cable making machine to give a conductor, the diameter of which is no greater than if the glass yarn had been omitted since the diameter of each conductor is 150-250 mu m. As a result of the high strength, low extension at break (compared to e.g. copper wire) and the retention of full elasticity up to 80% breaking load, the central glass yarn accepts all the tensile stresses arising during high speed stranding.

Description

Method for the production of a stranded conductor The invention relates refers to a method for producing a stranded conductor from several together stranded single wires.

Stranded conductors are plastic or rubber insulated for frequently moving Lines, such as the mains connection lines for irons, vacuum cleaners, etc. used. With those consisting of many individual conductors, e.g. 30 to 60 pieces Stranded conductors become the individual 1 gate mechanically at high production speeds stressed by strong choking and thereby the mechanical properties of the Very adversely affected copper wires. The elongation at break of the individual wires and thus the flexural strength of the stranded conductors in the finished product decreases.

So far, the deterioration in mechanical properties has been observed in Purchased, or - with higher demands - was done at a slower working speed manufactured. The invention is based on the object of a production method for to create such stranded conductors that maintain high production speeds allowed without the mechanical properties being unduly influenced. to for this purpose it is proposed according to the invention that when stranding the individual wires a bath made of glass silk thread is stranded in the center.

Glass silk thread has about five times the tensile strength of a soft one.

Copper wire and an elongation at break of approx. 2 ß compared to a medium one Elongation of 25 to 35 Vo (!) For copper wires. Glass silk is also at 80% the mean breaking load is still perfect elatic. The thread out Glass silk thread therefore absorbs all tensile parameters that occur both during the manufacture of the strand also arise in the later practical use of the conductor, and the properties the single conductor negatively affect. Therefore, a high production speed be respected. An increase in the diameter of the stranded conductor occurs not on. Since the individual conductors can have a diameter of 150 to 250 µm a thread of glass silk thread with a diameter of approx. 7 µm in the center of the Enter the ladder to be lost. He is in the cavities between the individual conductors embedded.

To illustrate the procedure is described below A stranded conductor constructed according to the proposal according to the invention is shown in the drawing. The true proportions are not included in it for the sake of clarity been retained. The thread of glass silk twine is in proportion to the size the single conductor is shown much larger.

The thread 10 made of glass silk thread runs when the individual conductors are stranded 11 centrally in the stranded conductor 12 and takes the otherwise acting on the individual conductors large tensile forces.

1 Figure 1 claim

Claims (1)

Claim method for producing a stranded conductor several individual wires stranded together, characterized in that the Stranding the individual wires (11) centrally with a thread (10) made of glass silk thread with stranded ends will. L e r s e i t e